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Help with C100 wiring.

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Old 08-09-2018, 09:52 PM
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Car: 1991 Pontiac Firebird Trans Am GTA
Engine: 5.0 305 TPI
Transmission: 4 Speed Auto sadly
Help with C100 wiring.

currently wiring up my ls carb swap. Have most of it figured out other than the A4 red wire and the G5 red wire. I am not completely sure about where they are supposed to go to. From what I read it says something about a power distribution block but I canít find that anywhere. Anything will help! Thanks
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Old 08-10-2018, 12:21 AM
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Re: Help with C100 wiring.

On a 91 GTA? G5 goes to the positive post on the starter with a fusible link. Powers the lights mostly. A4 goes to the same place on a different fusible link and powers damn near everything. If your diagram says "distribution block" you're probably looking at a TBI or 3.1L diagram, TPI cars don't have a block, they run everything to the starter. Pages 8A-10-2 8A-10-3, and 8A-10-4 are where you'll find those wires in the 91 Firebird manual.
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Old 08-10-2018, 03:53 PM
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Re: Help with C100 wiring.

C100 layout.
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Old 08-10-2018, 06:36 PM
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Re: Help with C100 wiring.

Yeah whoever made that diagram wanted it to be universal, or they just want to call the positive at the starter a dist block. Doesn't matter much, just on tpi cars everything runs off the starter and everything else uses a block by the battery.
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